Audio mixer



FIG. 1 is a top plan view of an audio mixer showing our new design;

FIG. 2 is a flipped rear elevational view thereof;

FIG. 3 is a front elevational view of FIG. 1;

FIG. 4 is a bottom plan view of FIG. 1;

FIG. 5 is a left side elevational view of FIG. 1;

FIG. 6 is a right side elevational view of FIG. 1; and,

FIG. 7 is a top, front and left side perspective view of FIG. 1.

The ornamental design for an audio mixer, as shown and described.